Kurt’s arm
At a young age, Kurt witnessed a predecessor to the Taur idol, one that purposefully “fed” the Harbingers. A Harbinger killed Kurt’s dog… and used her against Kurt…
The Rottweiler is an integral animal to the reason why Harbingers look the way they do, LONG before this incident with Kurt. That’s also why you’ve seen a Rottweiler earlier in this comic already. That and I LOVE Rotties.